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Hi there, I'm working on a project, where there is an existing opening that an Architect is trying to close up to create a building extension. See the below detail from the Architect. I need to design the infill. It seems like the simplest approach would be to design the slab to span the...

@RobertHale, Thank you very much your response is very helpful. Designing as an L beam seems reasonable to me and should be a more efficient way of designing the section (instead of a rectangular beam). In reality I believe the slabs will act as two way slabs, however for simplicity with hand...

Hi there, I'm working on a project, where I have designed a transfer beam that has slabs tying in to it at two different levels. Dimensions are shown below : I have a few questions. 1. Would you consider the beam to be a T beam when it has a split level of 2"? What would the cut off...

@BAretired thanks for the response and you make some fair points. Unfortunately, there isn't even one geotech here. However, in 1994 a geotech company did a report on the entire country but this report seems somewhat general and it doesn't give the bearing capacity allowance/settlement...

Hi there, I'm working on a project where we will be adding a 2nd storey onto a residential house. The existing house is very old so I wasn't expecting it to have any proper foundations. As a result, I was intending on underpinning the existing 8" hollow CMU house wall with a 2' wide x 1'...

Hi there, I'm working on a project where the client would like to add an additional storey to their existing 1 storey residential home. The existing building is built with 8"(203mm) hollow CMU block and doesn't appear to have any foundations. The building appeared to have just been built on...

Hi there, I'm working on a project where the client would like to remove a spiral staircase and infill the void. I'm unsure what the adjacent slab reinforcement is, so I'm uncomfortable relying on that to take the additional load from the infill slab. I was planning on framing out the...

It depends on where you are located and what the environment conditions are. If you are in a location with wind, the document below provides a methodical way of designing the drilled shaft foundation: https://chainlinkinfo.org/wp-content/uploads/2017/12/WLG-Updated-1.1.18.pdf It doesn't...

@HTURKAK Thanks this is very helpful. I redid the calcs using the revised approach of increasing the soil lateral capacity by 1/3 preliminary embedment depth. I also doubled the lateral soil capacity to allow for a 1/2" deflection. I'm assuming this is the approach you mention? (See...

Thanks Jeb, that is helpful. The foundation diameter I used was also 3'. I always get a bit anxious about these types of designs and how to deal with clients/contractors who complain about the depths. That's also true about the potential sidewalk restraint.

Hi there, I'm currently working on the foundation design for a traffic light structure. I am in a hurricane-prone region; I ran the numbers for two scenarios (173 and 144 mph wind speeds). However, I have a few questions regarding the wind analysis approach and the foundation design approach...

Hi there, I'm working on a small residential project, where I specced a beam with T8 shear links at 9" centres. I arrived at the site to review the progress and I saw that the contractor used T8 steel reinforcement but they used PRB (for around 20% of the length, which happens to be over a...

Good day, In the past, I've designed longitudinally spanning staircases, which require a detail like shown below at the top landing : However, for horizontal spanning stairs (spanning between walls), is that top detail still recommended for the distribution steel?

Hi there, I am working on a project, where the client would like to hang an exhaust hood from the timber floor joists. I've done a capacity check of the timber floor joists and they are fine for this application (the hood is only 450lbs and this will be spread between 2 joists). However...

Hi there, I'm working on a project where the client intends to install quite a large window(5x5'), which will take up most of an external wall. They've started construction already but wanted me to do a quick check. I want to make sure that the corner wall nibs can take the wind loads that...

Thanks for the replies so far. @TLHS It is either hollow CMU block or solid limestone block. @KootK Very helpful points. Where I'm from, for residential projects the contractors tend to mix concrete on site. Although, I never really trust the quality to be very high, so I tend to use 20MPa...

Hi there, I'm working on a residential project where the client would like to remove a wall, which is holding up a reinforced concrete slab and wall above. See below : I've carried out the structural analysis and the bending moment is relatively high due to the slab spans and the wall...

@SWComposites The walls are existing - I'm not sure why the original builders wouldn't have lined them up. As for the beam, I did a quick check just now on the loads and the beam would be somewhat lightly loaded, even with the walls above. The beam in the storage area would have a UDL...

@WinelandV Thanks for your recommendation. Filling like a normal underpin would perhaps be an easier solution. However, I believe the reasoning for the beam is to maintain a certain room size. For clarity - If I go the beam route and design one, it won't be bolted to the side of the...

Hi there, I recently got called to a job site where excavation has already occurred for a basement extension project. The excavator has excavated very close to the existing house wall. It appears that the house wall was sitting on a limestone chunk that was resting on a soft sandstone type...